Mid-conversation system messages are now GA without a beta header on Claude Fable 5, Mythos 5, and Opus 4.8 across the Claude API, Amazon Bedrock, and Google Cloud. Updating system instructions mid-conversation no longer invalidates cache prefixes.
19. jún 2026
•
Anthropic
Fable 5 is the first public-facing version of the Mythos generation; top-tier software engineering, knowledge work and vision, with hard safety guardrails.
19. jún 2026
•
Anthropic
Eve is a TypeScript-native open-source framework where every agent = a directory of files (instructions.md + tools/ + skills/). Built in: durable execution, per-agent sandbox, human approvals, evals, OpenTelemetry. Plus the Sandbox runtime now goes up to 24h.
19. jún 2026
•
Vercel
